Patent GB-1003310-A (GB)
Title: Bleaching processes and compositions
Inventor: CHASE BASIL HUGH
IPC: D06L4/12
Filed: 1963-01-15
Abstract: Detergent compositions comprises a soap or soapless detergent, an inorganic persalt and a " reactive " acyl sulphonamide, i.e. an acyl sulphonamide which fulfills the requirements of a described test, and which is defined as a compound of the formula <FORM:1003310/C4-C5/1> in which RCO- is a carboxylic acyl radical, R1SO2- is an organo sulphonyl radical and R11 is any suitable organic radical except a carboxylic acyl radical attached directly to the nitrogen as determined by the behaviour of the acyl sulphonamide in the said test.  R1 may be an alkyl, aryl or substituted alkyl group in which the substituents may include a further sulphonyl group and a further carboxylic acyl group.  R1 is preferably methyl or phenyl, R11 ethyl or phenyl and RCO acetyl or benzoyl. Any two of the radicals RCO, R1 and R11 may be linked together forming a divalent radical which with the nitrogen is a heterocyclic group. The inorganic persalt may be an alkali metal perborate, percarbonate, perpyrophosphate or persilicate.  The compositions preferably contain 1/4 -4 reactive sulphonamide groups for each atom of available oxygen in the persalt. The compositions may also contain sufficient of an alkali metal carbonate, silicate or phosphate, e.g. an orthophosphate, tripolyphosphate or pyrophosphate, to give solutions thereof a pH of 8-11, and 10-50% of the soap or soapless detergent, e.g. an alkyl aryl sulphonate (e.g. sodium dodecylbenzene sulphonate), alkyl sulphate, or coconut mono-ethanolamide, together with conventional detergent adjuncts, e.g. alkali-metal sulphates, sodium carboxy-methyl cellulose and fluorescent brightening agents.ALSO:Textile materials, e.g. cotton fabrics, are bleached with an aqueous solution of hydrogen peroxide and a "reactive" acyl sulphonamide, i.e. an acyl sulphonamide which, in the test described below, gives a titre of at least 1.5 ml. of 0.1 N sodium thiosulphate.  The test is carried out by dissolving 2.5 g. of sodium pyrophosphate, 0.615 g. of sodium perborate and 0.5 g. of sodium dodecyl benzene sulphonate in 1000 ml. of distilled water at 60 DEG C., adding an amount of amide such that for each atom of available oxygen present one equivalent of amide is introduced, stirring vigorously at 60 DEG C. and after 5 minutes pipetting a 100 ml. portion of the solution on to 250 g. of cracked ice and 15 ml. of glacial acetic acid, adding 0.4 g of potassium iodide and titrating the liberated iodine with 0.1 N sodium thiosulphate using starch as indicator.  A "reactive acyl sulphonamide" is defined as a compound of the formula <FORM:1003310/D1-D2/1> in which RCO - is a carboxylic acyl radical, R1SO2 - is an organo sulphonyl radical and R11 is any suitable organic radical except a carboxylic acyl radical attached directly to the nitrogen as determined by the behaviour of the acyl sulphonamide in the test described above.  R1 may be an alkyl, aryl or substituted alkyl group in which the substituents may include a further sulphonyl group and a further carboxylic acyl group.  R1 is preferably methyl or phenyl, R11 ethyl or phenyl and RCO acetyl or benzoyl.  Any two of the radicals RCO, R1 and R11 may be linked together forming a divalent radical which with the nitrogen is a heterocyclic group.  The hydrogen peroxide may be added directly to the bleaching bath but it is preferably liberated from an inorganic persalt, e.g. an alkalimetal perborate, percarbonate, perpyrophosphate or persilicate.  Compositions comprising an inorganic persalt and a reactive acyl sulphonamide may be prepared, the compositions preferably containing 1/4 -4 reactive sulphonamide groups for each atom of available oxygen in the persalt.  The compositions may also contain sufficient of an alkali metal carbonate, silicate or phosphate, e.g. an orthophosphate, tripolyphosphate or pyrophosphate, to give the solution a pH of 8-11, and 10-50% of an organic detergent which may be a soap or soapless detergent, e.g. an alkyl aryl sulphonate or alkyl sulphate, together with conventional detergent adjuncts, e.g. alkali-metal sulphates, sodium carboxy-methyl cellulose and fluorescent brightening agents.